<?php
class Ip2Location
{

        var $StartIP = 0;
        var $EndIP   = 0;
        var $Country = '';
        var $Local   = '';

        var $CountryFlag = 0; // 标识 Country位置
                              // 0x01,随后3字节为Country偏移,没有Local
                              // 0x02,随后3字节为Country偏移，接着是Local
                              // 其他,Country,Local,Local有类似的压缩。可能多重引用。
        var $fp;

        var $FirstStartIp = 0;
        var $LastStartIp = 0;
        var $EndIpOff = 0 ;

        function getStartIp ( $RecNo ) {
            $offset = $this->FirstStartIp + $RecNo * 7 ;
            @fseek( $this->fp , $offset , SEEK_SET ) ;
            $buf = @fread($this->fp , 7 ) ;
            $this->EndIpOff = ord($buf[4]) + (ord($buf[5])*256) + (ord($buf[6])* 256*256);
            $this->StartIp = ord($buf[0]) + (ord($buf[1])*256) + (ord($buf[2])*256*256) + (ord($buf[3])*256*256*256);
            return $this->StartIp ;
        }

        function getEndIp ( ) {
            @fseek ( $this->fp , $this->EndIpOff , SEEK_SET ) ;
            $buf = @fread($this->fp , 5 ) ;
            $this->EndIp = ord($buf[0]) + (ord($buf[1])*256) + (ord($buf[2])*256*256) + (ord($buf[3])*256*256*256);
            $this->CountryFlag = ord ( $buf[4] ) ;
            return $this->EndIp ;
        }

        function getCountry ( ) {

            switch ( $this->CountryFlag ) {
                case 1:
                case 2:
                    $this->Country = $this->getFlagStr( $this->EndIpOff+4) ;
                    //echo sprintf('EndIpOffset=(%x)',$this->EndIpOff );
                    $this->Local = ( 1 == $this->CountryFlag )? '' : $this->getFlagStr ( $this->EndIpOff+8);
                    break ;
                default :
                    $this->Country = $this->getFlagStr ($this->EndIpOff+4) ;
                    $this->Local =   $this->getFlagStr ( ftell ( $this->fp )) ;

            }
        }


        function getFlagStr ( $offset )
        {

            $flag = 0 ;
            while ( 1 ){
                @fseek ($this->fp , $offset , SEEK_SET ) ;
                $flag = ord ( fgetc ( $this->fp ) ) ;
                if ( $flag == 1 || $flag == 2 ) {
                    $buf = @fread ($this->fp , 3 ) ;
                    if ($flag == 2 ){
                        $this->CountryFlag = 2 ;
                        $this->EndIpOff = $offset - 4 ;
                    }
                    $offset = ord($buf[0]) + (ord($buf[1])*256) + (ord($buf[2])* 256*256);
                }else{
                    break ;
                }

            }
            if ( $offset < 12 )
                return '';
            @fseek($this->fp , $offset , SEEK_SET ) ;
            return $this->getStr();
        }
        function getStr ( )
        {
            $str = '' ;
            while ( 1 ) {
                $c = @fgetc ( $this->fp ) ;
                if ( ord ( $c[0] ) == 0  )
                   break ;
                $str .= $c ;
            }
            return $str ;
        }


        function qqwry ($dotip) {

            $nRet;
            $ip = $this->IpToInt ( $dotip );

            $this->fp= @fopen($C->INCPATH.'QQWry.Dat', "rb");
            if ($this->fp == NULL) {
                  $szLocal= "OpenFileError";
                return 1;

              }
              @fseek ( $this->fp , 0 , SEEK_SET ) ;
            $buf = @fread ( $this->fp , 8 ) ;
            $this->FirstStartIp = ord($buf[0]) + (ord($buf[1])*256) + (ord($buf[2])*256*256) + (ord($buf[3])*256*256*256);
            $this->LastStartIp  = ord($buf[4]) + (ord($buf[5])*256) + (ord($buf[6])*256*256) + (ord($buf[7])*256*256*256);

            $RecordCount= floor( ( $this->LastStartIp - $this->FirstStartIp ) / 7);
            if ($RecordCount <= 1){
                $this->Country = "FileDataError";
                @fclose ( $this->fp ) ;
                return 2 ;
            }

            $RangB= 0;
            $RangE= $RecordCount;
            // Match ...
            while ($RangB < $RangE-1)
            {
              $RecNo= floor(($RangB + $RangE) / 2);
              $this->getStartIp ( $RecNo ) ;

                if ( $ip == $this->StartIp )
                {
                    $RangB = $RecNo ;
                    break ;
                }
              if ( $ip > $this->StartIp)
                $RangB= $RecNo;
              else
                $RangE= $RecNo;
            }
            $this->getStartIp ( $RangB ) ;
            $this->getEndIp ( ) ;

            if ( ( $this->StartIp  <= $ip ) && ( $this->EndIp >= $ip ) ){
                $nRet = 0 ;
                $this->getCountry ( ) ;
                //这样不太好..............所以..........
                $this->Local = str_replace("（我们一定要解放台湾！！！）", "", $this->Local);

            }else {
                $nRet = 3 ;
                $this->Country = '未知' ;
                $this->Local = '' ;
            }
            @fclose ( $this->fp ) ;
            return $nRet ;
        }

        function IpToInt($Ip) {
            $array=@explode('.',$Ip);
            $Int=($array[0] * 256*256*256) + ($array[1]*256*256) + ($array[2]*256) + $array[3];
            return $Int;
        }

}
?>